Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine

Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine (Bemotrizinol/Tinosorb S) is an oil-soluble, photostable UV filter typically used around 1–10% in sunscreens and is generally non-sensitizing with low irritation rates in patch testing. It is a large, poorly skin-penetrating molecule, which limits sting and inflammatory potential even in sensitive users. Mild irritation can still occur in highly reactive or barrier-compromised skin (often driven by the overall sunscreen vehicle rather than the filter), so it is best classified as very gentle rather than inert. Safety Notes: Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine (BEMT/Tinosorb S) is used almost exclusively in leave-on sun protection and daily moisturizers with SPF, where it may appear at low “supporting” levels around 0.1–1% in multi-filter formulas to boost UVA/UVB coverage and photostability. In high-protection OTC consumer sunscreens (especially EU/UK/Asia) it is commonly used in the ~2–7% range, with observed maximums reaching 10% in some high-SPF, broad-spectrum products. This aligns with EU cosmetic use limits where BEMT is permitted up to 10% in finished products; it is not relevant for rinse-off products and is generally uncommon/absent in US-only sunscreen formulas due to US OTC monograph constraints.